Sure. In the highest income bracket that's half a penny per meal out of your paycheck.

In fact, you could just add a stipend to your paycheck, subtract a "food cost", and the food isn't free anymore.

Yes, the penny-per-meal charge would be a tiny amount of income which, presuming deductible business expenses did not increase to absorb it, would be subject to corporate income tax (which is really a retained profits tax.)

None of the companies involved are even going to notice it.

If food is taxed there, then yes. I think Google, FB, etc. can afford it. They can afford to give out free meals after all.

Even if it is, it's just a few pennies per day.